Abstract
Starting from 3.beta.-acetoxy-25,26,27-trinorlanost-8-en-24-al, 8 lanosterol analogs (10-17) with longer side chains than that of lanosterol were synthesized by Wittig reaction followed by catalytic hydrogenation. Cholesterol biosynthesis was examined in rat hepatic subcellular preparation (S10) incubated with [24-3H]-lanosterol in the presence of each of the 8 lanosterol analogs. Some of the analogs (10 and 12) caused slight inhibition, but 16 and 17 showed no inhibitory effect. The structure-inhibitory activity relationship of lanosterol analogs on cholesterol biosynthesis from lanosterol is discussed.

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